This way you could use something like TR-55 (if specfiied by the local governmetn, for example), then use SWMM to analyze your pipe network, basins, water quality, etc. I think there may be a way to input an inflow hydrograph into SWMM instead of using a Rainfall event and Runoff calculations. I input the same rainfall event that I used in TR-55 (24-hr, Type II storm with 7.2 inches of rainfall). I want to know if I'm setting up the model incorrectly, or is TR-55 really that conservative? No matter which combination of these motherds I choose, my Peak Flow rate at the outlet is much much smaller than that predicted by the TR-55 method (using the same basin size and % impervious, avg ground slope, etc). You can specify one of three infiltration methods (CN Number, Green, or Horton) and you can specify one of three routing methods (Steady Flow, Kinematic Wave, or Dynamic Wave). However, as far as I can tell, the methods it uses to calculate runoff are theoretical, and I get much smaller peak flow rates than I do with TR-55 using the "unit hydrograph" method. It's intruiging because of the price and alleged flexibility.
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